Index UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-K [X] Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2018 or [ ] Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from ______ to ______ Commission file number - 1-11353 LABORATORY CORPORATION OF AMERICA HOLDINGS (Exact name of registrant as specified in its charter) | Delaware | 13-37 ...